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Thread: Pest control in malt storage

  1. #1
    Join Date
    Jan 2003

    Pest control in malt storage

    Anyone know how I can control what appears to be a weevil infestation in our malt room. I do not have the luxury of calling a professional. I'd like to stomp them out before they explode into a major problem. Any help is appreciated.
    Phillip Kelm--Palau Brewing Company Manager--

  2. #2
    Join Date
    Oct 2003
    Santa Rosa CA USA
    What do they look like?
    Try vacuuming up everything and usic Boric acid dust or similar crawling creature powder on the floor. If it is the beetles I see occasionally, they are confused flour beetles (see Google image search), and they don't have chewing mouthparts that are very effective for whole grain, unless it is roasted at least 10 L. Munich 20 L and C80+ seem to be favorites. Malt dust is their favorite and you can see random trails in the dust. Imagine their delight if they eat malt dust (and not very much) to find grain dust all over a malt room. Dust collection or control on the mill or malt transfer system helps immensely. Removing them from a mill can just be done by persistent vacuuming...and getting rid of the vacuum bag which they will just fester in and eventually crawl out of.
    I would guess gestation is about 3 weeks, maybe less in warm weather, so anything sitting around that long is suspect. All open bags should be in plastic tubs or such, where there is some containment, or at least you can tell where they are coming from. I tried putting dry ice in the malt tubs to suffocate them, ut it was not as successful as I had hoped.
    Basically, starve them out.

  3. #3
    Join Date
    Oct 2008

    What did you do?

    Hey Phil.
    I was just searching here and saw this old post. I am currently having a problem with sawtooth grain beetles. I think they came with the mill. Anyway, my approach was fumigation of mill room, auger and grist case with phosphine. It worked, but it seems that I carried them back to malt storage in/on an opened bag of malt, and they got into some bags, so now they are in the mill again. I am going to try putting the remaining bags of malt in the mill room and fumigating all of it with phosphine for a few days. I would toss the malt, but they seem to only be in a few bags..... I don't know if the phosphine will penetrate the bags though.

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